Re download app with redeemed code

I have a set of redeem codes associated to a VPP purchase. I went ot my phone itunes and entered the first code. The app download started automatically. Unfortunately, due to a network problem, the download failed. Now returning to itunes I cannot find any way to re try downloading the app. Also re-entering the code obviously does not work (the code has already been used). So how can I re-try downloading the app on that phone without using a different code?